Experts advise using the composition of the M500 (and not M300) to create a screed, which provides a greater strength of the base of the floor. Cracks may appear if unwashed sand with clay impurities was used. In this case, the base dries unevenly, and microwaves occur. And finally, the most common error is incorrect care of the base.
Since the upper layer dries faster, the screed must be constantly wetted for three days. At this time, you cannot open the doors and windows, use heating devices. Nevertheless, there is no need to redo the screed in your case, but only on condition that the surface of the base turned out to be even. You can safely lay a substrate on it, and on top of it – a parquet board.
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